Method and apparatus for the drawing of slivers



Jan. 1, 1957 KRUSE 2,775,858

METHOD AND APPARATUS FOR THE DRAWING OF SLIVERS Filed June 11, 1952 2 Sheets-Sheet l m Y I I INVENTOR ARTHUR KRUSE BY lib 7 @14 ATTORNEY Jan. 1, 1957 A. KRUSE 2,775,858

METHOD AND APPARATUS FOR THE DRAWING OF SLIVERS Filed June 11, 1952 2 Sheets-Sheet 2 INVENTOR 7 ARTHUR KRUSE ATTORNEY METHOD AND APPARATUS non v DRAWING OF'SLIVERS Arthur Kruse, Zell/Wiesental,"Baden, Germany Application June 11, 1952, Serial No..29 2,963

Claims riori a lication German May 1952" I H p ty, pp y junction with additional calendermg rollers positioned 'after the imparting of false twists to the slivers, whereby 13 Claims. (Cl. 5751) a The present invention relates to a method and corresponding apparatus for the drawing of slivers, and makes possible a greater compressing and consolidating-of the I sliver with reduced sliver friction and themaki'ng uniform of the slivers or partial slivers.

One characteristic of the inventionconsists thereinthat the otherwise customary drawing frame, for instan'cw-f a four-roll drawing frame, has connected behindit an additional pair of rolls, which makes possible the forming of the card web into a sliver. Between thepair of delivery rolls of the drawing frame and the additional pair of 1 cylinders connected behind same in accordance with the present invention, there is effected in the new arrangement" a narrowing of the card web into a sliver, for which purpose there may also be used a condensing'funnel of a type known per se. The latter is advisedly arranged" directly in front of the additional pair of ro1ls. -Iii the case of drawing frames for the elongating of individual? slivers, the use in front of the drawing frame'of such a compressing zone has been known for a long timell In,

drawing drawing-frames in which in all cases morethan"{35 purpose with smooth rolls, or, as otherwise summ ry; I

also with grooves and rings through which the slivers "run. v 14 By the new combination of means old in themselves, .f namely the combination of a drawing frame andan additional pairof rolls or calendering rollersypossi bly preceded by a condensing funnel in front of saidjroll'e'rsp there are obtained a number of technical advantages which 5 will be described in greater detail belowon basis-of one embodiment given by way of illustration, these advantages, i. being in particular, brought about thereby that the twists impartedto the sliver are maintained up to or after the calendering rollers arranged over the twisting plate.

A further characteristic of the invention which likewise results inthe retaining by the sliver oflthe, twist imparted it and an additional compressing of the sliver is the provision of a third calendering roller above the twisting plate. p i 3 m Furthermore, in accordance with the present invention, a strengthening of the places of transition from right twist to left twist and vice versa in the slivers may be obtained in the following manner: Two partial slivers are laid off side by side, as so-called twin slivers,in ,ca ns through a coiler common to both slivers.- This brings the slivers, to which the false twist is provided, so close together that they touch one another and strengthen themselves reciprocally through adhesionl o f the fibers upon emerging from the cans. The reciprocal strengthen-Q ing of both twin slivers is, according to the inyention,

2,775,858 Patented Jan. 1, 1957 increased by the fact that the weak places of every sliver,

"ice

" which, with the imparting of a falst twist, are the places of transition of the right to left twists (and vice versa) are no longer adjacently positioned in both slivers, as was formerly the case. Instead, they are staggered with respect to each other, preferably by half the distance between these places of transition in each sliver. The

staggering of the points of transition between the false twistsof the twin slivers is effected in accordance with the invention by either employing a third roller in conone of the slivers passes around the additional roller, while the other does not, with this additional roller being 5 so dimensioned as to cause the points of transition to be staggered in the desired manner, or, in the alternative,

the twisting tubes for imparting false twists to the twin slivers may be actuated out of synchronization in such a manner as to cause staggering of these points of transition. One embodiment of the entire arrangement in accordance with the invention is shown in the drawing,

' in which Fig." l'is, a side view shown diagrammatically; Fig. 2 is. the corresponding top view; Fig. 3 is a modification of the apparatus shown in sidevview.

Fig. 4 is afrontelevation of a preferred embodiment of a roller pair construction in accordance with the invention;

Fig. 5 is a diagrammatic partial rear elevation showing a further embodiment of the calender roll and twisting quired for actuating twisting tubes out of synchronization;

Fig. 8 is a diagrammatic front elevation of a cam and switches arranged for actuating drive motors of Fig. 7; Fig. 9'is a diagrammatic plane view showing a pair of the twisting tubes in Fig. 7.

The web which is to be worked first of all runs through a drawing frame of any desired construction, for instance, a frame having the roll pairs 1/I2/II-3/III4/IV to the roller pair 5/V arranged behind said drawing frame and at a sufiicient distance from it. The distance between the nip of delivery rolls 4/IV of the drawing frame and the nip of the pair of rolls 5/V is selected so large in accordance with the present invention that it permits the forming of the web into a sliver. After leaving the pair of rolls 4/IV, the web produced, for instance, from four, fed slivers has a width of, for instance 55-60 mm. after it has been reduced in the front drawing field from about 65-70 mm. by sliver edge compressor to this width. After leaving roller pair V/5, it still has a width of about 10 mm.

In accordance with the new arrangement, there is effected between roll pairs 4/IV and 5/V a compressing of the web into a sliver, in which connection, for instance,

there are used condensers 13 connected directly in front of roll pair S/V. Roll pair 5/V, in accordance with another arrangement of the apparatus of the invention as shown in Fig. 4, also is designed as a pair of 5 calendering rollers in order to obtain a still more inarranged after the drawing frame supplies a compressed,

finished, drawn sliver which gives the following vadvantages.

The drawing frame sliver has an increased strength as compared with the otherwise customary drawing frame slivers. Inasmuch as a narrow, condensed sliver rather than a broad, loose web runs over the guide plate, the sliverfriction is considerably reduced. Due to. the. fact that in connection with the new arrangement asliver rather than a web leaves the drawingframe, the twist can be imparted up to a higher point close to the nip of roll pair S/V without it being necessary in this-connection to fear any lack of uniformity in this part of the sliver, as otherwise could scarcely be avoided when imparting twist up to the vicinity of the nip.

The arrangement in accordance with the present invention of the additional pair of rolls S/V behind the draw-- ing' frame, furthermore makes possible an improvement of the uniformity of the drawing frame slivers or partial slivers as compared with the quality previously obtainable in connection with such slivers inasmuch as these.

slivers can now be made uniform in cross-section by the imparting of twist with a twisting tube G'and'an effective draft'bet ween roll pair S/V and the calendering, rollers 7, 8. By the draft any thick sliver places possibly present are thinned, inasmuch as they take up less twist and therefore can be more'easily drawn outthan the thinner sliver places-havinga'stronger twist. In this manner the sliver is made uniform between roll pair 5/V and. the calendering rollers 7, 8, as is done in a similar. manner also in connection with rovings' on wool-spinning frames.

This method can also'be used forordinary'drawing frame slivers-and partial slivers without twisting, provided that, in the case of sufiiciently thick partial slivers, and particularly in the caseofcarded material or staple fiber, one ca n get along without the imparting of'the In thispresent invention alongside the two calendering rollers- 7, 8 a third roller 9 in order to assure a dependable-- guiding of the sliver emerging from the twisting'tubeto the oblique channel 10'- of the rotating plate. T his third pressing roller- 9 deflects the sliver in vertical direction without loss of twist when working with a twisted sliver; nevertheless it can be used with just as great advantage in connection with ordinary drawing operating without twisting tubes in order to avoid the formation of cut slivers at the place of change of direction to the rotating plate.

The use of the third pressing roller 9, as well asof the other devices described, makes possible an increasing of the adherence ofpartial slivers at the plncesof transition from one direction of twist to the other by a'strongcr twisting, by compressing of the sliver before its entrance into the twisting tube and also by shortening; the transition places of the false twists. The stronger twisting and stronger compressing-of the sliver is madepossible by meansof the additional pair of rolls S/V; the shorteningofthe transition places which is also obtained by the stronger twisting and compressing is advisedly maintained by an additional compressing with rings and grooves in thepressing rollers. as shown in Fig. 4. Furthermore, it

is advisable to keep the passage channels in the rotating.

plates as smallas possible and to lift the bottoms of the cans, even upon the beginning of the removal, as close as possible to the rotating plates, so that the twists imparted'to the'sliver' are retained also upon delivery into the can.

A substantial increase of the strength of the sliverv at the transition places from left twist to right twist and vice versa is effected in accordance with a further characteristic of the present invention in the following manner:

Every two slivers, a, b, after passing through the twisting tubes 6, are fed in the form of a twin sliver in such a manner to the can that their places of transitionlS from the left twist to right twist in both partial slivers running along side of each other, do not lie in the same cross-section of the twin sliver, but rather are staggered with respect to each other as schematically shown in Fig. 2. In this connection, it is advisable to move these places of transition on one of the two slivers to the center between the places of transition of the other sliver. The slivers emerging from the twisting tubes are sufficiently round and'smooth to run out of the can without disturbances and with good separation in connection with the further working in the roving frame.

In order: to conduct the slivers of a twinsliver with their: transition places staggered with respect to each other into the can in accordance with the present invention, several structural solutions are possible. Thus, for instance, one of the slivers a, as shown in Fig. 3, can be slung around the third pressing roller 9, the circumference of the pressing roller 9 correspondingto onehalf the distance between two adjacent places of transition: The other sliverb, accordingly, runs between-the pressing. rollers. 9, 8 directly to the rotating plate 10, while the other a is guidedaround the upper pressing roller:9 or aroundthe guide roller 7 provided as third rollen Theguiding of sliver A in this manner around the; additional roller is effected so that the point of transition of the falsetwists in each of these slivers A and, B? are staggered with respect to each other, thus accounting for substantial strengthening of the twin sliver. In this arrangement the apices of the two twisting; tubes 6 should be as close to each other as possible. In this connection the can carries out approximately a full revolution towards the left, then towards the right, etc.

i In connection with another arrangement as shown in Figs. 7, 8 and 9 in accordance with the present invention,.the beginning of the periodically interrupted and retestablished drive of the twisting tubes is controlled in sucha manner thatthe drive of the one tube lags behind that of the other tube by one-half an interval, due to which the staggering of the places of reversal of the partial slivers is obtained. In this case, both slivers of a twin sliver run through the calendering rollers and the common revolving plate on the same path. The guiding.

belt Bl and pulleys 14 and each of the other tubes 6 of "the series is rotated by drive belt B2 and pulley 14. Belt B1 is driven by electric motor M1 and belt B2 by motor M2. The motor M1 is started in actuation by the closing of switch S1 and stopped upon opening of the. switch. In the same manner the closing of switch S2 starts 'the motor M2 and the opening thereof stops this motor. and closed'by means of the rotating cam E and the Spring loaded'cam followers F1 and F2 respectively.

By the afore-described cooperation of individual apparatus which are in part known per se, and particularly of 'the additional pair of rolls 5/V in combination with thetwisting tube 6 andin combination with new measures, particularly the third calendering roller, and, in connection with twin slivers, with the staggering of the places of transition from left twist to right twist and vice versa, there is obtained a substantially stronger. sliver which runs outof the cans free of disturbance upon further working, for instance, in roving frames. A substantialadvantage of the invention is furthermore con- At this place the increased tensile stress of the twin sliver The switches S1 and S2 are alternately opened slivers always has sufficient twist and thus also a sufficiently high strength to pull the other one along and to overcome the relatively short distance of high stress.

I claim:

1. A method for the drawing of slivers, which comprises drawing two webs simultaneously through a drawing frame, preliminarily compressing said webs emerging from said drawing frame into two parallel, side-by-side slivers, thereafter imparting false left and right twists to each of said slivers, staggering the points of transition between left and right twists of each of said slivers with respect to each other, and compressing said slivers into a twin sliver.

2. A method in accordance with claim 1, in which said twin sliver is deposited in a receptacle.

3. An apparatus for the drawing of slivers, which comprises a drawing frame for the simultaneous drawing of two webs therethrough, roller means positioned behind said drawing frame for the compressing of said webs passing through said drawing frame into two parallel, side-by-side slivers, means positioned behind said roller means for imparting false left and right twists having transition points therebetween to each of said slivers, means for staggering the transition points of said slivers with respect to one another, and roller means positioned behind said twisting tubes for compressing said slivers into a twin sliver.

4. An apparatus in accordance with claim 3, in which said last-mentioned roller means is a pair of calendering rollers and said means for staggering the transition points of said slivers is an additional roller positioned adjacent said calendaring rollers for the passage of one of said slivers thereover.

5. An apparatus in accordance with claim 4, in which 7. An apparatus in accordance with claim 3, in which said means for imparting false left and right twists to said slivers is a pair of twisting tubes.

8. An apparatus in accordance with claim 7, in which said means for staggering the transition points of said slivers is means for actuating said twisting tubes out of synchronization.

9. An apparatus in accordance with claim 8, which includes a rotatably mounted oblique tube positioned after said last-mentioned roller means for the passage of said twin sliver therethrough.

10. Apparatus according to claim 3, in which said firstmentioned roller means is a pair of rollers.

11. Apparatus according to claim 3, including a condensing funnel positioned between said drawing frame and said first-mentioned roller means.

12. Apparatus according to claim 3, in which said first-mentioned roller means is a pair of ca'lendering rollers with smooth surfaces.

13. Apparatus according to claim 3, in which said firstmentioned roller means is a pair of calendering rollers with compressing grooves and ribs.

References Cited in the file of this patent UNITED STATES PATENTS 3,250 Graves Sept. 1, 1843 532,405 Threlfall Jan. 8, 1895 536,620 Goldsmith Apr. 2, 1895 775,690 Sykes Nov. 22, 1904 1,864,020 Ingham June 21, 1932 2,181,777 Asbellc Nov. 28, 1939 2,257,041 Eastman Sept. 23, 1941 2,301,677 Banfield Nov. 10, 1942 2,322,711 Gwaltney et al. June 22, 1943 FOREIGN PATENTS 426,549 Great Britain Mar. 29, 1935 500,599 France Dec. 27, 1919 515,672 Great Britain Mar. 2, 1938 

